This set is generally considered (along
with the Collins R390A) to be the finest, most sensitive
general communications receiver ever to enter service
from the tube era. Incorporating Dr Trevor Wadley's
famous 'Wadley Loop' circuit, this superbly made
instrument firmly established Ray Brown and Calder
Cunningham in the defence electronics business.

It is a cast aluminium monster with
a plethora of controls for finding the right station. Yet
the tuning scale is accurate to 5kHz and drift is almost
non-existant. My particular example dates from November
1961 and takes a proud place in my collection.